The invention provides an exhaust device for improving the exhaust quality of packaging bags, which relates to the technical field of packaging bag exhaust, and includes a conveyor belt, an exhaust roller, and drive mechanisms respectively erected on both sides of the conveyor belt. All are equipped with guide rails, and the exhaust rollers straddle the conveyor belt through the cooperation of the roller shafts with the guide rails. The exhaust rollers include a first binder surface and a second binder surface, and the first binder surface There are several ventilation holes on the top, and the second pressing surface is solidly set; when the packaging bag moves with the conveyor belt and passes under the exhaust roller, the driving mechanism can drive the exhaust roller to roll back and forth on the packaging bag The way to discharge the gas in the bag. By implementing the technical solution, the exhaust quality of the packaging bag is improved, residual air in the packaging bag is avoided, and the risk of damage to the packaging bag is reduced.